From Petrucci's guitar tech: Played this for 10 mins, heres what I can remember about it. each channel has: 3 voices, a bold/dark switch, 3 power settings, eq selector, Gain, treb, mid, bass, presence knobs. channel 1 voicings- Clean, Fat Clean, Tweed channel 2 voicings- Edge, Crunch, Mark I channel 3 voicings- Mark IIc+, Mark IV, Extreme 3 power settings are 10w, 45w, 90w eq selector selects graphic on/off/footswitchable (graphic has 2 eq pots added) selectable tube/diode rectification for each channel tweed setting on power switch, simul class but was loaded with 6l6's reverb, serial loop, footswitch has 8 switches on it. Mark IIc+ sounds great, Mark IV sounds like my Mark IV lead channel, Mark I is nice and dark. Fat Clean and Crunch sound like my Stiletto. They told me it is the exact circuitry of the Mark IIc+ and Mark IV when you select those modes. Quote: The cleans were awesome. Best I've heard on a Boogie. I remember one of the cleans being very 3-D and almost, single channel vintage-ish in it's 'fullness'. At that time, there was also a mode that, to me, was the closet they've gotten to a Marshall tone. Very cool. Not sure how much it's changed at this point. I did love the fact the graphic was assignable per channel. So you could have the 'smiley face' heaviness, without fucking up everything else. It was also the first Boogie I ever thought I'd be happy with owning. Here's a pic of the prototype Petrucci was using.